I came across this when trying to verify TEIIDDES-2478.
When you have a LDAP instance with big amount of entries (in the screenshot in JIRA you can see that are 931 entries) in some part, it takes long to load all attributes. After clicking Next> on the page shown in screenshot (see attachment in JIRA) JBDS freezes and doesn't respond for about 3 minutes. At least we should have some message that says, that TD is loading data from LDAP.